/Engine/Plugins/Experimental/Mutable/Source/MutableRuntime/Public/MuR/Instance.h
Get an image resource id from a component
an ummodifiable pointer to the requested image. The returned object is guaranteed to be alive only while this instance is alive. The ownership of the returned object remains in the instance, so it should not be deleted.
FResourceID GetImageId ( int32 lod, int32 comp, int32 surf, int32 img ) const